Automatic X-ray entrance dose compensation

Details Automatic X-ray entrance dose compensation Automatic X-ray entrance dose compensation

1984-01-09

1986-05-20

Church, Craig E.

X-ray or gamma ray systems or devices

Electronic circuit

X-ray source power supply

378110, H05G 144, H05G 134

Patent

active

045906033

ABSTRACT:
An X-ray tube is movable between a minimum distance from an image receptor and a maximum distance. Signals are generated representative of the X-ray tube focal spot-to-image distance (SID), the peak kilovoltage (kVp) that is to be applied to the X-ray tube anode during a fluorographic exposure and the desired brightness of the X-ray image. The signals are processed in a manner that results in a control signal being developed that adjusts the X-ray tube filament current in a way that produces an X-ray tube current (mA) during the exposure which results in a constant limited X-ray dose rate at the X-ray beam entrance plane of a patient at any permissible kVp and SID setting and assures that the dose rate limit will not be exceeded at minimum permissible SID regardless of the selected kVp.

REFERENCES:
patent: 3803418 (1974-04-01), Holstrom
patent: 3894235 (1975-07-01), Franke
patent: 4339825 (1982-07-01), Barrett et al.
patent: 4403337 (1983-09-01), Kleinman
patent: 4423521 (1983-12-01), Haendle et al.
patent: 4454606 (1984-06-01), Relihan
patent: 4475224 (1984-10-01), Grassme

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